Silicon Carbide Brick

Silicon carbide bricks are advanced refractory materials made mainly from SiC, featuring a series of excellent properties such as high strength at both normal and high temperatures, large thermal conductivity, small thermal expansion coefficient, good thermal shock resistance, excellent high-temperature wear resistance, and strong resistance to chemical erosion. It is widely applied in the steel industry, non-ferrous metallurgy, petrochemical industry, power, ceramics and aerospace fields.

1. Steel metallurgy
   Blast furnace lining: Used in the abdomen, bottom layer and lower stack area to withstand extreme temperatures (>1500°C) and slag erosion.
   Hot blast stove: Due to its high thermal conductivity and thermal shock resistance, it can be used as a heat exchanger in high-temperature air ducts.
   Molten iron treatment equipment (such as torpedo ladles, mixers) : Resistant to chemical corrosion by molten iron and slag.
2. Nonferrous metal smelting
   Aluminum electrolytic cell: Lining material used to resist corrosion by molten aluminum and cryolite (Na₃AlF₆).
   Copper-zinc smelting furnace: It is used in the furnace chamber and flue to withstand metal vapor and high-sulfur environments.
3. Ceramics and glass industry
   Kiln furniture (shelves, feeders) : Supports the ceramic body during repeated firing (1300-1600°C) and prevents deformation.
   Glass furnace: Used in the regenerator inspection device for waste heat recovery.
4. Chemical and energy industry
   Gasifier: The lining material of Shell/Texaco gasifiers resists slag erosion under high temperature and high pressure.
   Petrochemical refining: Linings for fluid catalytic cracking (FCC) units, durable catalyst wear and acidic gases.
5. Environment and New Energy Applications
   Waste incinerator: Can withstand highly corrosive combustion environments (such as HCl, SO₂, etc.).
   SiC ceramic filters: used for high-temperature dust removal (such as in coal-fired power plants).

（1）Oxide Bonded Silicon Carbide Brick

Items	Specifications
	Clay Bonded SiC	Mullite Bonded SiC	SiO2 Bonded SiC
SiC  %	＞85	＞70	≥90
Bulk Density  g/cm3	2.5~2.6	2.55~2.65	2.6~2.7
Apparent Porosity  %	≤20	≤16	≤15
CCS  MPa	≥100	≥100	≥120
CMOR  MPa	≥20	≥25	≥25
Thermal Expansion Coefficient℃-1 20~1000℃	4.6×10-6	4.6×10-6	4.7×10-6
Thermal Conductivity  W/(m·K) 1000℃	≥11	≥11	≥13

（2）Nitride Bonded Silicon Carbide Brick

Items	Specifications
	Si3N4 Bonded SiC	Si3N4 Bonded SiC	Sialon Bonded SiC
SiC  %	≥70	≥72	≥71
Si3N4  %	≥20	≥20	/
N  %	/	/	≥5.5
Al2O3  %	/	/	≥5
Fe2O3  %	≤1.0	≤0.7	≤0.7
Bulk Density  g/cm3	≥2.60	≥2.65	≥2.65
Apparent Porosity   %	≤18	≤16	≤16
CMOR  MPa	≥40	≥45	≥45
HMOR MPa 1400℃	≥40	≥45	≥45
CCS  MPa	≥150	≥160	≥150
Thermal Conductivity  W/(m·K) 1000℃	≥15.5	≥16	/

（3）Self-bonding Silicon Carbide Brick

Items	Specifications
	β-SiC Bonded SiC	Recrystallized SiC
SiC  %	≥94	≥99
Bulk Density  g/cm3	≥2.63	≥2.65
Apparent Porosity  %	≤17	≤15
CMOR  MPa	≥30	≥90
HMOR  MPa 1400℃	≥30	≥90
CCS  MPa	≥140	≥300
Thermal Expansion Coefficient ℃-1 20~1000℃	5.5×10-6	4.8×10-6
Thermal Conductivity  W/(m·K) 1000℃	≥12	≥20

（4）SiSiC Brick

Items	Specifications
SiC  %	≥80
Si  %	12~18
Bulk Density  g/cm3	≥3.0
Apparent Porosity  %	≤0.5
CMOR  MPa	≥220
HMOR  MPa  1400℃	≥240
CCS  MPa	≥800
Thermal Expansion Coefficient ℃-1  20~1000℃	4.5×10-6
Thermal Conductivity  W/(m·K) 1000℃	≥40